Implement Query API

[Morgul]

Implement a query api, inspired by django's query api.

Basically, how I would like this to work is like this:

dustbin.query({someKey: "valueToMatch", someOtherKey: "someOtherValueToMatch"});

We can support the field api from django like this:

dustbin.query({someKey__lt: 5, someOtherKey__contains: "partial string"});

Alternatively, we could do this using a jugglingdb like api:

dustbin.query({lessThan: {someKey: 5}, contains: {someOtherKey: "partial string"}});

I'm not sure which I like better.

[Morgul]

This was partially implemented in 6f575b7.

[lordnull]

I refer you to issue #1 . If the browser supports map and filter natively, this does not look like a particularly useful set of features.

dustbin.query('bucket').filter(function(obj) { return obj.someKey < 5; });

var ltFive = function(obj){
    return obj.someKey < 5;
}

var containGoober = function(obj){
    return obj.someOtherKey.match("goober");
}

dustbin.query('bucket').filter(ltFive).filter(containGoober);
ducstbin.query('bucket').filter(function(obj){
    return ltFive(obj) && containGoober(obj);
});

[Morgul]

As per issue #1, support for this seems near universal. Unless there's any reason to make things easier, all that needs to be done, really, is documentation.